Headstock-bearing for lathes



G. E. GIIEENIEAF; HEADSTOCK BEARING `FOR LATIIES.

APPLICATION FILED NOV. 9, |918.

1,345,67 1 1 Patented fully @9, Imm.

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ti'rhltllt'rll E. GREENLEAJF, @F PLAINFJEELD, NEW JERSEY,

ll'l) COMPANY, OF NEW YURVJ. ll". Y., lli CRPRATIUN Ol NEW JERSEY.

HEADTClt-BEARlNGr FOR LI-lrllltlES.

Application tiled' Novenibs-:r 9, 191%.

To @ZZ fte/tom t may concern.'

Beit known that l, Gnoaen l. Gamin- Lnar, a citizen ofthe United States,residing' at llainiield, in the county of Union and @tate of llewJersey, have invented certain new and useful Improvements inl-leadstocl-Bearings for Lathes, of which the following is aspecification.

The object `of theinvention is to provide an improved bearingP for theinner end of the main work spindle of a lathe headstock whereby thespindle may be raised or lowered either for preliminary adjustment or tocompensate for wear.`

ln the accompanying drawing, which shows the preferred embodiment of theinvention,

Figure l is a front elevation, with parts broken away and shown insection, of a lathe headsto'clr having, a bearing1 embodying; myinvention. y

Fig'. 2 is an end view of the hea-dstoclr. the face plate being removedand a part of the adjusting means'being shown in section. i

3 is a fragmentary view similar to lirn. 2 but showing the bearing'details on an enlarged scale.

i Referring to the drawing, the lathe headstock comprises lower andupper frame tions 1 and 2 which arel secured together in any usual orpreferred manner. The main worlr spindle is indicated at 3 and isarranged iMhorizontally. It is supported in two bearings t and 5 whichare carried on the frame preferably on the lower section thereof. Alsocarried by the frame is suit able gearing' 6 for driving the spindle..lts illustated7 the lathe is driven by an electric motor 7 which isconnected with the lgearing; t5. Preferably the frame sections 1 and 2are so constructed as to constitute a cas iupf which incloses the majorportions of the drive gearing and of the spindle 3. rlihe details of thedrive gearing' and of the frame or easingF can be varied widely but thatwhich lf have shown for 'purposes of illus tration is similar to thatpresented in the copending; 'application of George E tireenleaf'andhtililiiord li. Randolph for lathe l'ieadstocks, tierial No. 61,780gEled liloveinbei' 9, 1918. i

The bearing 5 comprises upper and lower brasses 8 and 9 which directlyengage the journal part of the spindle. rlhese brasses Specification ofLetters Patent.

llatented duly tl, 122th serial no. serrer.

are mounted in a recess which is formed partly in the lower section l ofthe frame and partly in a cap 10 bolted to the lower section. lhe 'sidesof the lower brass 9 are vertical and engage vertical guides formed atthe sides of the bearing recess.

The bottom of the brass 9 is inclined at 11 and a wedge blo'clr v12 isinterposed between the inclined bottom 11 of the brass and thehorizontal bottom 13 of the recess. The frame section lis provided atthe rear with a horizontal aperture 14C adjacent the rear end of thewedge block 12. 'llhe front or inner part of the aperture 111 isthreaded at l5 arid a hollow bolt 16 tits the threaded part of theaperture and at its front end engages the rear end of the wedge block12. it bolt 17 extends through the aperture in the bolt 16 and isthreaded into an aperture in the wedge block 12.

By means of the two threaded bolts 1G and 17, the wedge block can bemoved positively in either direction. lf the wedge block is to be movedtoward the rear to raise the brass 9 both of the boltsI 16 and 17 arefirst loosened, the bolt 16 being turned only to a. slight extent. theenact amount of movement being' determined by the desired amount ofmovement of the 'wedge blockn lhen the bolt 1'? is turned in the otherdirec tion. rlhc head of the bolt 17 abuts against the head of the bolt16 and thus enables the bolt 17 to positively draw the wedge bloclr 12rearward until it engages the front end of the bolt 16. When the wedgeblock is to be moved toward the front, the bolt 17 is first loosened andthen the bolt 16 is turned until the wedge bloclr has been moved. to thedesired extent. After that the bolt 17 is tightened, thus locking' thewedge block in adjusted position. lt will be observed that after eitheradjustment the block is directly engaged by both bolts, being' thusfirmly loclred in position. The two bolts engage each other and thusfrictionally hold each other against turning.

l@il is supplied to the bearing through a hole 13 and oil is permittedto flow from the bearing; through a hole 19 in the bottom brass 9. 'lhehole 19 registers with a hole in the wedge block 12, this hole 2Obeing,V elongated to permit movement of the block without moving; thehole out of register. From the hble 20 the oil discharges into a drainpassage 21.

The adjusting means that I have described can be used at the initialconstruction or Yassembling of the lathe to properly aline the workspindle, Its principal usefulness, however, is to compensate Jfor thewear which occurs after the lathe has been used. 'Vhen heavy pieces ofwork are turned, considerable weight is thrown on the bearing 5 with theresult that the lower brass thereof wears relatively rapidly. Even asmall amount of wear will throw the spindle out of alinement and thusinterfere with the accuracy of the lathe. lVith a lathe headstockembodying my invention the inner spindle bearing can be taken up fromtime to time as wear takes place, the spindle being thus maintained incorrect alinement at all times.

Vhat I claim is:

l. In a lathe headstock, the combination of a box-like frame, ahorizontal work spindle, drive gearing for the spindle inclosed withinthe frame, bearings provided at the respective ends of the frame, thework spindle being mounted in such bearings, passing through the frameand projecting outside thereof at one end, a lathe face plate mounted onsuch projecting end7 the bearing adjacent the face plate including anupper brass and a lower brass provided with a plane wedge-engagingbottom, a wedge block under the lower brass and engaging the bottomthereof, and screw means engaging the wedge block and extending throughthe frame to the outside whereby the wedge block may be vpositivelymoved in either direction to raise or lower the work spindle and faceplate to compensate for wear.

2. In a lathe headsteck, the combination of a box-like frame, ahorizontal work spindle, drive gearing for the spindle inclosed withinthe frame, bearings provided at the respective ends of the frame, thework spindle being mounted in such bearings,

passing through the frame and projecting outside thereof at one end, alathe face plate mounted on such projecting end, the bearing adjacentthe face plate including an upper brass and a lower brass each providedwith a hole therein for the passage ol' the bearing lubricanttherethrough and the lower brass being provided with a planewedge-engaging bottom, a wedge block cngaging the bottom of the lowerbrass and provided with an elongated hole registering with the hole inthe lower brass whereby the bearing lubricant is drained from thebearing, and screw means engaging the wedge block and extending throughthi` frame to the outside whereby the wedge block may be moved in eitherdirection to raise or lower the work spindle and face plate tocompensate for wear.

3. In a lathe headstock, the combination of a frame comprising an uppersection and a. lower section, a, horizontal work spindle, drive gearingfor the spindle inclosed within the frame, bearings provided at thercspective ends of the frame and supported on the lower sectionindependenti).v of the upper section, the work spindle being mounted insuch bearings, passing through the frame and projecting outside thereofat one end, a lathe face plate mounted on such projecting end, thebearing adjacent the face plate including an upper brass and a lowerbrass, a wedge blockunder the lower brass and engaging the bottomthereof, and screw means engaging the wedge block and extending throughthe frame to the outside whereb)7 the wedge block may be moved in eitherdirection to raise or lower the work spindle and face plate tocompensate fior wear.

In testimony whereof I hereto ailix my signature.

GEORGE E. GREENLEAF.

